Rotary hammer



(No Model.) y 2 Sheets-Sheet 1.

P. J.K"RARNS.'

ROTARY HAMMER. v No. 351,867.v Patented Nov. 2, 1886.

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P. J. KBARNS. ROTARY HAMMER.

No. 351,867. I Patented NOV. .2, 1886.-

WIT/VESSES: /lVI/E/VTOH v ATTORNEY' UNITED STATES PATENT OFFICE. 1

PATRICK J. KEARNS, OF CHICAGO, ILLINOIS'.

` ROTARY HAMMER.

SPECIFICATION forming part of LettersPatent No. 351,867, dated November 2, 1886.

Application tiled August 4, 1886. Serial No. 210,030. (No model.)

To all whoml may concern,.-

Be it known that I, PATRICK J. KEARNs, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in RotaryHammers; and I do hereby declare that the following is a full, clear,

and exact description of the invention, which will enable others skilled in the art to which it appertains to Ina-ke and use the same, reference being hadto the drawings, and to the letters of reference marked thereon, which` form a part of this specification. v

The object of my invention is to provide a 'rotary hammering-machine which has a number of hammers capable of rotating around a common center,which can be manipulated by hand or steam power,which is adapted to take the place in many instances of the hand-hammer, and which is especially useful in stone` cutting, drilling, and blacksmithing, substantially as hereinafter described, and as illus- .trated in the drawings, in which-- Figure l is a side elevation of the rotary hammers. Figs. 2 and 3 show end oredge views thereof. Fig. 4 shows a front elevation of the means employed for jornaling and manipulating said rotary hammers, and Fig. 5

- shows a side elevation of the machine shown upward.

The anvil is placed a. suitable distance from the circle described by arms C, and,at such`adistance below the center of shaft B.J that the faces of the hammers strike the anvil squarely. If necessary, the helves of the hammers might be curved so as to accomplish this result.

In order to preventthe hammers from swing- This shaft B has fast on it,

ing past the radial line of the arms C, I make integrant with or secure to the extremities of said arms the stop c, and in order to prevent the hammers swinging back upon the arms to which they are pivoted I provide stops d d.

In Fig. 3 is shown a series of sets of arms, C C C C, connected at their pivotal points by boss b and at their extremities by the stops c and'd. rIhe modification shown in this figure (3) is adapted for use in cutting stone. It is necessary in such work to move the hammer laterally. To accomplish this the hammers may be pivoted between the extremities of any two contiguous arms C desired.

In Fig. la crank is shown on the yend of shaft B for revolving it (and the hammers) by hand. If it is desired to operate it by steam, I extend one end of the shaft sufficiently beyond its bearings and journal loosely on its end a pulley, D. The boss of this pulley is elongated laterally toward the contiguous standard, has its end edges serrated, and has a circumferential groove in it, into which the lateral pins in the bifurcated ends of the shifter-lever e enter. The opposite end of lever e (which is fulcrumed between lugs projecting from the adjacent standard) is connected by the connecting-rod E to a treadle. By pressing the foot on this treadle the pulley D and elongated bossare moved laterally until lthe serrated edges of the latter mesh with the ob- Y versely serrated edges of boss f, made fast to said shaft, and impart its motion thereto. The elongated boss of pulley D and boss f form a clutch, which imparts the motion of said pulley to the shaft B whenever desired. y

In order to return the pulley to its original position when the foot is removed from the treadle, I surround connecting-rod E with a coil expansionspring, F, immediately below lever e, and rest the lower end thereof on a platform projecting. from standard A, substantially as shown in Figs. 4 and 5. In Fig. 5 is shown another lway of accomplishing the result the construction shown in Fig. 8 was designedgfor. In Fig. 5 the shaft between its bearings is screw-threaded and provided with a longitudinal groove. The bearing-surface of the bore of boss bis provided with a feather, which enters this groove. The boss b, Sto.,

IOO

bloeks G of shaft A. The blocks are tapped vertically to one side of the bearing of shaft A,for the accommodation of the vertical screws g g. The lower ends of these screws are prep erly journaled, and are provided with pinions 7L h, and are engaged by an idle-gear, H. This gear I-I is revolved by means of radiating hand-grasps, or any suitable way, and turns the screws g g in such way as to raise or lower the bearing-boxes G.

In order that the belt communication between the main shaft and pulley D may be maintained when shaft B, carrying the hammers, is adjusted vertically, an arm, I, loose on the shaft, but so connected with its boss as to be shifted with pulley D,is provided. This arm has bearings in its extremity for a short shaft with pulleys on both ends, one of which is connected to pulley D and the other with the main shaft. This construction, as reference to the drawings will disclose, permits of the vertical adjustment of shaft B.

As there are many ways in which the pulley and clutch connections may be shifted, I do not wish to be confined to the means hereinbefore described.

I do not, moreover, wish to be confined to the means for operating the screws which adjust the bearing-blocks G vertically, as I have described and shown them, for it is apparent that the screws might extend up through the top of the standards,and there adj ust cranks to them to manipulate the screws by hand.

Vhat I claim as new, and desire to secure by Letters Patent, is-

1. In a hammering-machine, the combination of the boss b, arms radiating therefrom,

having stops c, as described, and the hammers C', pivoted at or near the extremities of said arms, as set forth.

2. The combination, in a hammering-nia chine, with the arms C, radiating from a boss, b, of hammers C', pivoted to said arms at a suitable point between stops c and d, projeeting laterally from said arms.

The combination, with arms C, radiating from a common boss, and hammers C, pivoted at or near the extremities thereof, of shaft B and means for adjusting said hammers laten ally.

4. The combination, with arms C, radiating from a common boss, and hammers C', pivotcd at or near the extremities thereof, shaft B, and bearings thereof, of screws g and means for operating the same,

5. The combination, with arms C, radiatingr from a central boss, and hammers pivoted to said arms, of shaft B, means for operating the same, and standards A, in which said shaft is journaled.

6. The combination, with arms C, radiating from a central boss, and hammers pivoted at or near the extremities of said arms, of shaft B, means for operatingtlie same, standards A, bearings G, in which said shaft is journaled, screws g g, pinions h on thclower ends thereof, and gear H.

7. The combination, with arms C, radiating from a central boss, hammers C', pivoted at or near the extremities of said arms, shaft B, pulley D, loose on said shaft, having elongated boss, the edges of which are serrated, boss f, designed to be engaged by said pulley-boss, shifter lever e, connecting-rod E, treadle, and expansion-spring I, of standards A, bearingblocks G, screws g g, pinion h, and gear I-I.

In testimony that I claim the foregoing as my own I hereunto affix my signaturein pres ence of two witnesses.

PATRICK J. KEARNS.

Witnesses:

FRANK' D. THoMAsoN, JNO. V.S1cKELs. 

